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Mica is a kind of rock forming mineral, usually in a plate like, flaky, and columnar crystalline form of a false six square or a diamond.

Because of its high temperature resistance, gloss, physical and chemical properties of stability, good insulation, flexibility and toughness, so the insulation and heat resistance and the use of it in industry, as well as acid, alkali resistance, compressive strength and exfoliation of insulating material for electrical equipment and electrical equipment, except for electrical insulation also, for the building materials industry, industry, fire extinguisher, welding wire, plastic, paper, asphalt paper, rubber asphalt, pearlescent pigments and other chemical industry.

The color characteristics of mica are usually used to characterize the insulation properties of mica. The industrial mica are usually light colored muscovite, the next is gold mica, and the insulation performance of biotite is the worst. The elastic coefficient of muscovite is 15346 – 21760bar, and the biotite is 14500 – 19480bar. When using mica as insulating material, it has strict requirements for its elasticity. Mica and mica powder can be processed into mica paper, and can also replace mica sheet to make all kinds of low cost and uniform insulation materials.

Mica insulation performance is the most important factor determining its industrial value. Mica insulation performance is determined by the electrical properties of mica. The electrical properties of mica are determined by testing breakdown voltage and breakdown strength. According to the test results of mica in each mining area, the average breakdown voltage is 2 – 5.7kV and the breakdown strength is 133 – 407kV/mm when the thickness of mica sheet is 0.015mm.

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